21259772 has 12 divisors (see below), whose sum is σ = 37473240. Its totient is φ = 10553136.

The previous prime is 21259757. The next prime is 21259783. The reversal of 21259772 is 27795212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18563 + ... + 19674.

It is an arithmetic number, because the mean of its divisors is an integer number (3122770).

Almost surely, 2^21259772 is an apocalyptic number.

It is an amenable number.

21259772 is a deficient number, since it is larger than the sum of its proper divisors (16213468).

21259772 is a wasteful number, since it uses less digits than its factorization.

21259772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38380 (or 38378 counting only the distinct ones).

The product of its digits is 17640, while the sum is 35.

The square root of 21259772 is about 4610.8320290377. The cubic root of 21259772 is about 277.0253640100.

The spelling of 21259772 in words is "twenty-one million, two hundred fifty-nine thousand, seven hundred seventy-two".